Weekend of week 13...Any activity recommendations? (Prague)

Hi, I am coming back to Prague and plan to stay from March 27th to the 31st. I know a few people in Prague already, but always up for meeting more. Also, I like to explore while I am there and was curious if anyone could recommend some exhibits, activities, events and etc that will be going on while I am there. I am planning on staying in the Prague 1 area.